Piplup locations — where to catch

In Blueberry Academy (Scarlet & Violet – The Indigo Disk)

• Polar Biome — Walk

In Hisui (Legends: Arceus)

• Islespy Shore — Walk
• Spring Path — Walk

In Sinnoh (Diamond, Pearl & Platinum)

• Lake Verity — Gift
• Route 201 — Gift

Other games (2)

• Brilliant Diamond / Shining Pearl (Gen 8): Lake Verity
• Omega Ruby / Alpha Sapphire (Gen 6): Hoenn Route 101

Piplup — full Pokédex entry